Reflecting electric lamp.



H A. DOUGLAS.

REFLECTlNG ELECTRIC LAMP. I

APPLQCATlON HLED FEB. 19. 1917- 1 61 "*1 yg y v l atented Apr. 9, 1918' 2 SHEETS-SHEET 2- DQlTi't'LAS, 03E E3031 $015, EKI'GHIGAN, ASSIGNOR T DOUGLAS & RUDD MEG. (30.,

3F BEQNSAGIET, MI'JHIGAN, A CQBPORATIGN 01* ZdICEIG-AN.

ELEGTEIC LAMP.

Specification of Letters Patent,

Patented Apr. Pi, 191$.

Application filed. February l9, 1917. Serial No. 149,668.

other mechanism whose operation is permit eerily distinct from the reflector, a plug in v Eli) ted by the switching mechanism for adjusting the lamp bulb with reference tothe concave reflector that enters into the lamp con struction;

In accordance with one of the features of my invention there are employed switching contacts Within the reflector carrying concove casing that is preferably but not necesthe shell that holds the lamp bulb and cou pled Withthe shell in a manner that permits the plug to be turned, a. rod extending-- from the plug to the casing and operable from the exterior of the casing to turn the plug, a head piece connected with the rod for turning it and a spring for maintaining the head piece in engagement with the casing whereby the head piece is confined to e single plane of rotation.

In accordance with another characteristic of the -invention the shell {that carries the lamp bulb is movable in and out whereby the lamp bulb may be adjusted with respect to the reflector and in order that this adjustment may be permitted the rod is movable longitudinally and with respect to the head piece While remaining coupled with the head piece whereby the head piece is adapted to turn the rod in all of the positions to which the shell and lamp bulb may be adjusted in and out; lfhe mechanism for adj listing the shell in and out is desirably inclusive of e. screw connected witlrthe shell and operable from the exterior of and engaged with the casing.

I will explain my invention-more fully-by reference to the accompanying drawing showing the preferred embodiment thereof and in which Figure 1 is a side elevation,

I partially in section, of n reflecting lamp con,

teining features of my invention; Fig, 2 is a, longitudinal view, part ally in section partially in elevation of portions of the struttuwe illustrated in Fig. 1; Fig. 3 illustrdtes at part of the adjusting rod and. the head therefor in perspective; Fig. 4 is a View on line H of Fig. 1; Fig. 5 is a View partiallyin elevation and, partially in section of parts; and Fig. 6 is s View taken on line c c of Fi 2.

Like parts are indicated by imilar chair acters of reference throughout the difierenf The concave reflector 1 is received in the I reflector carrying concave casing 2 here shown as distinct and spaced apart fi'om the reflector, but to' which construction the invention is not to be limited. When these elements 1 and 2 are separate they are cou-.

pled in any suitable Way, leaving a space intervening between the reflector and casing;

The reflector includes a rearwerdly extending tubular continuation 3 in fixed relation with the balance of the reflector, this continnation constituting a holderor mounting.

A spring tongue 4 is integrally formed witha shell 5 that constitutes a holder for contact carriers, this spring tongue having am; ple clearance at its side margins topermit it freely to function. Some part of the tongue, such as the rear free end thereof, has

a part 6 projecting therefrom which is nar rower than the ha a side of the holder whereby the shell-isigheld in engagement withthe holder 3. I The slot T is elongated so that the shelltmjejt be moved back and forth in its holdcrswe teby in the structure illustrated the position of the lamp bulb 8 which is carried by-the forward end of the shell front ot-the rehector maybe adjusted With respect to the reflector. The base 9 of the lamp bulb 8 constitutes the forward contact cerrier'andas the arrangement illustrated is a double pole arrangement this contact carrier 9 carries two rear contacts 16 and 11. The lamp base or contact carrier 9 is provided with bayonet 12 engegesble Within bayonet nce of the tongue and is slightly narrower than a slot 7 in the holder.

seats 13 constituting parts of bayonet slots The rear contact carrying plug 15 with-.

in the casing 2 is provided with terminal blocks 16 having binding screws 17 by which circuit wires may be secured to the terminal blocks. These terminal blocks are cylindrical and the forward ends thereof are tubular springs 18 being included in the tubular portions of the terminal blocks and operatingx to press contacts 19, 20 forwardly into engagement with the contacts 10 and 11, all of these contacts being within the casing. The springs 18 and the contacts 19 and, 20 thus not only serve to establish circuit for the lamp but also operate to hold the lam base 9 in bayonet pin and slot connection with the shell 5. The plug 15 is rotatable within the rear end of the shell 5 in order that it may perform its switching function and when thus movably mounted it is provided with bayonet pins 21 and which are receivable inalternate bayonet seats 22, 23, the plug being inserted from the front end of the shell with its pins passing along the bayonet slots 1 1 until they are in the zone that includes the bayonet seats 22, 23 whereafter the base of the lamp bulb is inserted in the shell with its pins 12 placed in the bayonet seats 13. The springs 18 thus not only serve to hold the bayonet pins 12 in the seats but also serve to hold the bayonet pins 21 in the seats to which they are adjusted.

It will be observed that the con'iplemental switching contacts 10 and 19 are eccentric with respect to the shell as are also the complement-a] switching contacts 11 and 20 so that as the plug is turned these contacts are either brought into engagement or are separated according to the direction of movementof the switching plug 15. When the lamp is in open circuit the contacts 19 and 20 are pressed against the insulating portions of the lamp base that are adjacent the contacts 10 and 11, the springs '18 continuing to press the contacts. 19 ,and 20 for wardly to maintain the bayonet pins upon the switching plug and upon the lamp base in their respective bayonet seats. The shell. and the parts within it are in front of the casing 2 and in order thatthc switchingplug 15 may be turned or otherwise moved with respect to the lamp base to cut the lamp in and out of circuit I employ a motion transmitting connection in the form of a switching rod 24 which is connected at -1ts inner .end truth the switching plug and which is operable from the exterior oiithe casing. This switching rod may be turned'to turn the switching plug to its open circuit or closed cir cuit position, this arrangement being broadly claimed in my co-pending application, Serial llo. 119,666, filed February 19, 1917. Other li'eatures are claimed in my co-pending application Serial No. 149136 1, filed February 19, 1917, In my present invenis movable longitudinally with respect to the head piece but turns therewith, the back end of the rod being desirably made square as indicated at 24: while the head piece'is provided with a correspondingly shaped bore 25 receiving the square endof the shaft 24.

The shell 5 carries a bracket 27 that pro jects through the slot 28 in the holder 3. A screw 29, supplied in addition to the rod 2 1, is in threaded connection with the bracket 27 and is therefore connected with the shell 5. The head 30of the screw 29. engages the casing. By turning the screw the shell 5 is moved in and out to adjust the lamp bulb with respect to the reflector. The spring 26 expands or contracts to follow, at its forward end the plug 15, this movement of the plug being permitted when the screw is turned owing to the engagement between the rod 24 and the head piece 25 that permits this rod to move in and out with respect to said head piece. This screw and its complemental parts thus constitute means supplied in addition to the rod 24 for moving the lamp bulb in and out.

The particular form of lamp 11 illustrated is what is known as .a spot light but to which form of lamp the invention is not to be limited. When the lamp is, in the form of a spot light the casing is provided with a handle 2 and this handle I constitute a rearward continuation of the casing, the switching rod 21 passing through the handle to a point where it is operable from the exterior of the casing.

Any suitable means may be employed for establishing circuit relation between the cont-acts upon the plug 15 and the external source of current, there being illustrated a well known form of connector 15 which maybe employed for this purpose.

' While I have, herein shown and particu larly described the pceferrecl embodiment of my invention I do not wish to be limited to the precise vde ails of construction shown as within the casing and mounted to turn in the L shell to have alternative positions to cut the lamp in and out of circuit'and having bayonet pin and slot engagement with the shell in the alternative positions of the plug; a rod extending from said plug and operable from theexterior of the casing for turning the plug; spring means for holding said contact in engagement to establish cir-. cuit and operating to hold the plug in ci'rcuit' opening and circuit closing positions; a head piece for the rod; a spring for maintaining the head piece in engagement with lamp bulb in and out.

the casing, said rodbeing movable longitudi- I nally and with respect to the head piece and=" turning with the head piece in its various positions with respect thereto; and a screw in connection with the shell and engaging the casing and operable to movethe shell and 2. In a. reflecting electric lamp; the com bination with a reflector carrying casing; of an electric lamp bulb; a shell carrying the lamp bulb at its front end; a contact carry- 7 ing plug within the casing and coupled with a head piece for the rod; a spring for maintaining the head piece'in engagementwith the casing, saidrod being movable longitudinally and with respect to thehead piece and turning with the head piece in its varif -ous positions with respect thereto and a screw in connection with the shell and engagingthe casing and operable to move. the shell and lamp bulb in and out.

3.111 a reflecting electric lamp, the com-, bination with a reflector carrying casing; of an electric lamp bulb; .a shell carrying the lamp bulb at itsfront end and having bayonet pin and slot connection, with the base of the lamp bulb; eccentrically disposed. switching contactswithin the casing for cuttin thellamp in andoutof circuit; a plug wit llIl the casing and mounted to turn in the shell to have alternative positions to cut the lamp in and out of circuit-and having bayonet pin and slot engagement with the shell in the alternative positions of the plug; a rod extending from said plug and operable from the exterior of the casing for turning the plug; spring means for holding said contacts in engagement .to establish circuit and operating to hold the plug in circuit opening and circuit closing posit ons; a head piece for the rod, said rod being movable longitudinally and with respect tothe head ing for turning the plug piece and turning with the head piece in its various positions with respect" thereto; and a gcrew in connection with the shell and engaging the casing and operable to-move the shell and lamp bulb in andout.

4. In a. reflecting electric lamp, the combinationwith a reflector carrying casing; of

an electric lamp bulb; a shell carryingthe lamp bulb at its front end; a contact carrying plug within the casing and coupled with the shell for supplying current to the lamp and mounted to turn with respect to the shell. to cut the lamp in and out of circuit, there being engageable eccentrically located switching contacts in the lamp circuit,

one upon the plug; a motion transmitting rod extending from the plug and operable 80 from the exterior of the casing to turn said plug; a head piece for the rod, said rod being movable longitudinally and with respect to the head piece and turning with the head piece in its various-positions with respect thereto; and a screw in connection with the shell and engaging the casing and operable to'move the shell and lamp bulb in and out.

5. In a reflectin electric lamp, the co1nbi-' nation with a re ector carrylng casing; of

an electric lamp bulb; a shell carrying the lamp bulb at its front end; switching contacts within the casing for cutting. the lamp in and out of circuit; a plug within thelcas ing and coupled with the shell and carrying one of said contacts and movable with respect to the-shell; means operable from the exterior of the casing for efi'ectingrelative motion between the plug and shell to cut the lamp in and out of circuit; and a screw engaging the casing and being connected with the shell and being operable from the exterior of the casing. to move the shell in and out to adjust the lamp bulb with'respect to the reflector.

6. In a reflectin electric lamp, thecombination with a re ector carrying casing; of

an electric lamp bulb; a shell carrying the v lamp bulb at its front end; engageable eccentrically disposed switching contacts within the casing for cutting thelamp in and out of circuit; a plug Within the'casing and mounted to turn inthe shell and coupled therewith and carrying one of said contacts means operable from the exterior ofthe castocut the lamp in and out of circuit; an a screw engaging and being operable from the exterior of the casing to move the shell in and out to adjust the lamp bulb with respect to the reflector.

In Witness whereof, I hereunto subscribe my name this 27th day of January, A. D.;

HARRY DOUGLAS.

the casing and being connected with the shell 

